import time

# 返回当前的时间戳（1970以后）
# print(time.time())
# 格式化时间戳，获得时间元组
# print(time.localtime(time.time()))  #
#output：time.struct_time(tm_year=2018, tm_mon=8, tm_mday=31, tm_hour=14, tm_min=27, tm_sec=46, tm_wday=4, tm_yday=243, tm_isdst=0)
# print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))  # 格式化自己想输出的形式
#output：2018-08-31 14:27:46

import datetime

# print(datetime.datetime.now())
#格式化输出
# print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
# print(datetime.datetime.today())
# start = datetime.datetime.now()
# while True:
#     for i in range(100000000):
#         pass
#     break
# end = datetime.datetime.now()
# print("程序运行时间：" + str((end-start).seconds) + "秒")
